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Termination of Merger with Illumina (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 09, 2021
Feb. 28, 2021
Mar. 31, 2020
Jun. 30, 2021
Merger Termination [Line Items]        
(Loss)/Gain from Continuation Advances from Illumina   $ (52,000)   $ (52,000)
Equity or debt financing that must be raised in a single transaction     $ 100,000  
Illumina, FC Ops Corp [Member]        
Merger Termination [Line Items]        
(Loss)/Gain from Continuation Advances from Illumina     $ 52,000  
Convertible Senior Notes [Member]        
Merger Termination [Line Items]        
Principal amount of notes $ 900,000 $ 900,000    
Debt instrument, stated interest rate 1.50% 1.50%    
Maturity date Feb. 15, 2028 Feb. 15, 2028